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Controlling the oxidation state of molybdenum oxide nanoparticles prepared by ionic liquid/metal sputtering to enhance plasmon-induced charge separation.

Kazutaka AkiyoshiTatsuya KameyamaTakahisa YamamotoSusumu KuwabataTetsu TatsumaTsukasa Torimoto
Published in: RSC advances (2020)
Nanoparticles composed of molybdenum oxide, MoO x , were successfully prepared by room-temperature ionic liquid (RTIL)/metal sputtering followed by heat treatment. Hydroxyl groups in RTIL molecules retarded the coalescence between MoO x NPs during heat treatment at 473 K in air, while the oxidation state of Mo species in MoO x nanoparticles (NPs) could be modified by changing the heat treatment time. An LSPR peak was observed at 840 nm in the near-IR region for MoO x NPs of 55 nm or larger in size that were annealed in a hydroxyl-functionalized RTIL. Photoexcitation of the LSPR peak of MoO x NPs induced electron transfer from NPs to ITO electrodes.
Keyphrases
  • ionic liquid
  • room temperature
  • oxide nanoparticles
  • heat stress
  • photodynamic therapy
  • hydrogen peroxide
  • stress induced
  • energy transfer
  • visible light
  • walled carbon nanotubes